What do historians call a source of historical information created from the interpretation of other sources of historical evidence?

It can be inferred that the dramatic increase in defense spending by germany was the result of. (a) attempts by great britain to take german colonies. ( b) fear of a two-front war against france and russia (c) the need to put down a communist rebellion (d) a competition with the allies to produce atomic weapons

On a production possibility curve, data points that fall outside of the curve represent an inefficient allocation of resources. a balanced allocation of resources. ideal production. a currently unattainable production.

1. america's first national road morse 2. joined lake erie with the hudson river cooper 3. steam-driven locomotive erie canal 4. allowed businesspeople to keep in touch with trends cumberland 5. telegraph code fulton 6. clermont telegraph